支払いは消費税込みで千円です。
- The payment is 1,000 yen including tax.

支払いは消費税込みで千円です。 meaning: The payment is one thousand yen, including consumption tax.

⚫︎ The sentence follows a typical Japanese sentence structure: topic - comment. ⚫︎ The topic is indicated by the particle は(wa). 支払い(shiharai - payment) is the topic. ⚫︎ The comment (what is being said about the topic) is 消費税込みで千円です(shouhizei komi de sen en desu - It's one thousand yen, including consumption tax.) ⚫︎ です(desu) is the polite copula (to be) and indicates politeness.

⚫︎ で(de) has many uses, and in this sentence, it indicates the means or method. ⚫︎ 消費税込みで(shouhizei komi de) means "including consumption tax." 込み(komi) is the stem of the verb 込む(komu - to include, to be included). ⚫︎ Here, で(de) indicates that the consumption tax is *included* in the price. ⚫︎ Other uses of で(de): location ("at"), time ("in"), and means ("by" or "with").

⚫︎ 込み(komi) is a noun meaning "inclusion" or "including." It's derived from the verb 込む(komu - to be included, to include). ⚫︎ It can be used in a few different ways: ⚫︎ As a noun, e.g., 料金込み(ryoukin komi - including the fee). ⚫︎ Following a noun to mean "including" (as in this sentence). ⚫︎ Can also be used as part of a verb phrase. ⚫︎ It is often used to clarify pricing or what is included in a service or purchase.

⚫︎ 千(sen) means "thousand." ⚫︎ 円(en) is the counter for Japanese currency (yen). ⚫︎ The structure is: [number] + [counter]. ⚫︎ Japanese counters are essential for specifying quantities of things. You must use the correct counter for what you are counting (e.g., people, animals, flat objects, etc.)

⚫︎ です(desu) is the polite copula, meaning "is" or "are." ⚫︎ It adds politeness to the sentence. ⚫︎ Without です(desu), the sentence would be 支払いは消費税込みで千円だ(shiharai wa shouhizei komi de sen en da), which is less polite. ⚫︎ です(desu) is used in a very wide variety of sentences to show respect to the listener.